fixed filename in dal storage, thanks Marin

VERSION

@@ -1 +1 @@
-Version 2.2.1 (2012-12-03 17:38:35) stable
+Version 2.2.1 (2012-12-03 18:01:57) stable

gluon/dal.py

@@ -8558,8 +8558,8 @@ class Field(Expression):
         if self.custom_store:
             return self.custom_store(file,filename,path)
         if isinstance(file, cgi.FieldStorage):
-            file = file.file
             filename = filename or file.filename
+            file = file.file
         elif not filename:
             filename = file.name
         filename = os.path.basename(filename.replace('/', os.sep)\